Red Screen

Brightness 100%
Timer Mode

Set a timer for fullscreen display. Useful for timed screen tests and ambient lighting sessions.

Red Screen background

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#FF0000
Custom Color
Opens one color window per detected screen. Drag & fullscreen each.
Free & Browser-Based

Free Online Screen Savers – No Download Required

Transform your display with beautiful, interactive screensavers that run right in your browser. Choose from digital clocks, productivity timers, ambient animations, and mesmerizing visual effects — perfect for idle screens, desk displays, presentations, and relaxation.

Fullscreen screensavers • Animated backgrounds • No installation • Works on Windows, Mac, Linux, Chromebook & mobile

Digital Clock Screensaver - Free Online Screensaver Preview

Digital Clock Screensaver

Beautiful digital clock screensaver with 10 color themes, 4 fonts, glow effects, and Wake Lock API. Runs fullscreen in y

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Pomodoro Timer - Free Online Screensaver Preview

Pomodoro Timer

Free Pomodoro timer with customizable durations, sound alerts, progress ring animation, and session tracking. Boost your

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Matrix Rain Screensaver - Free Online Screensaver Preview

Matrix Rain Screensaver

Classic Matrix-style green falling code screensaver with customizable speed, density, colors, and character sets (Kataka

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Rain on Window Screensaver - Free Online Screensaver Preview

Rain on Window Screensaver

Relaxing rain on window screensaver with realistic raindrops, lightning flashes, thunder sound, and fog effect. Perfect

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Starfield / Space Travel - Free Online Screensaver Preview

Starfield / Space Travel

Hypnotic 3D starfield screensaver with warp speed control, nebula colors, and shooting stars. Travel through space in yo

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Custom Text Screensaver - Free Online Screensaver Preview

Custom Text Screensaver

Display custom text fullscreen with animations. Choose bounce, scroll, fade, or float effects. Customizable font size, c

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Free Prank Tool

Fake Update Screens – Free Online Prank Tools

Realistic fullscreen prank screens — BSOD, Windows updates, Ubuntu upgrades, iOS updates, and hacker terminals. Launch any screen fullscreen and watch your friends panic. Press ESC to exit anytime.

Fake update screens • BSOD prank • Windows update prank • Hacker screen • Ubuntu update • iOS update • Fullscreen prank tools

Windows BSOD Screen

Generate a realistic Windows Blue Screen of Death (BSOD) with authentic error codes, QR code, and CRITICAL_PROCESS_DIED

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Windows 10 Update Screen

Simulate a realistic Windows 10 update screen with customizable timing, non-linear progress, and authentic blue interfac

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Windows 11 Update Screen

Simulate a realistic Windows 11 update with circular progress ring, dark interface, and Windows logo. Free fullscreen pr

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Ubuntu Update Screen

Simulate a realistic Ubuntu Linux system upgrade with terminal output, real package names, and progress tracking. Free f

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iOS Update Screen

Simulate a realistic iOS software update with Apple logo, circular progress bar, and phase-based status messages. Free f

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Hacked Terminal Screen

Display a dramatic hacker terminal with auto-typing exploit commands, Matrix rain background, and CRT scanline effects.

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Screen Testing Tools

Auto Color Cycle

Rapidly cycle through colors to help fix stuck pixels. Run for 20–30 minutes for best results.

OLED Burn-in Test

Display a moving pattern to detect and reduce OLED burn-in artifacts on your screen.

Gradient Smoothness Test

Display smooth gradients to check for color banding and bit-depth issues on your monitor.

Checkerboard Pattern Test

Display pixel-level checkerboard patterns to test monitor sharpness and pixel response.

Pixel Response Time Test

Flash rapid black/white transitions to evaluate pixel response time and ghosting.

Viewing Angle Test

Display color bands to help evaluate your monitor's viewing angle consistency.

Gray Uniformity Test

Display 50% gray to reveal backlight hotspots, clouding, and brightness non-uniformity.

Color Accuracy Checker

Display reference color swatches to compare against known standards for calibration checks.

Multi-Monitor Detection

Detect connected displays and open fullscreen color on all screens simultaneously.

Drag each window to a different monitor, then click Go Fullscreen inside it.
Detected Screens
Click "Refresh" to detect…

About Red Screen

A red screen isolates the red sub-pixel channel of your display, making it invaluable for thorough pixel testing. Each pixel on your monitor is composed of red, green, and blue sub-pixels. By displaying pure red, you can identify sub-pixel defects that might be invisible on a white or multi-color screen.\n\nRed screens are also popular for ambient lighting. The warm, low-wavelength red light is less disruptive to night vision and circadian rhythms compared to blue or white light. Astronomers use red screens on tablets to preserve dark adaptation while checking star charts, and photographers use them in darkrooms.\n\nFor gaming setups and content creation, a red screen provides dramatic background lighting for streaming and video production. It creates a bold, energetic atmosphere without the harshness of white light.\n\nRed light therapy enthusiasts also use full-screen red displays as a supplementary light source, though dedicated devices are more effective for therapeutic purposes.

Frequently Asked Questions – Red Screen

A red screen isolates the red sub-pixel in each pixel. If a sub-pixel is dead, it will appear dark against the red background. This catches defects invisible on white screens.

Red light has a longer wavelength and is less likely to suppress melatonin production compared to blue light. Using a red screen at night is less disruptive to your sleep cycle.

Yes. Red screens are used in darkroom photography to provide safe light that won't expose light-sensitive paper. Digital photographers use them as colored fill lights.

Try the Auto Color Cycle feature on this page. Rapidly cycling through colors can sometimes unstick a stuck pixel by stimulating the transistor. Run it for 20-30 minutes.

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